He said it was because of Nitish Kumar that he changed his earlier decision to give up politics.
"I was determined to retire from politics. But I have again entered politics after Nitish Kumar made a request," he told the media here.
Jha said he saw neither a Narendra Modi nor a Rahul Gandhi wave in Bihar while campaigning for the Lok Sabha election.
"There is only a wave for development, and Nitish Kumar has worked for development of the state."
The Janata Dal-United has fielded Jha, who lost the 2009 Lok Sabha battle on LJP ticket. He says he is now confident of winning.
Jha is known for making films like "Gangaajal", "Apaharan", "Raajneeti", "Satyagraha" and "Aarakhshan".